00442nam a2200133Ia 4500 220204s9999 xx 000 0 und d 631.11:001.814 SHA SHANER, W W Farming systems research and development: Guidelines for developing countries. Colorado Westview 1982 Westview special studies in agriculture/aquaculture science policy Farming systems BK 38853 38853 0 0 0 0 MAIN MAIN 2021-12-16 0 631.11:001.814 SHA 19204 2021-12-16 00:00:00 2022-02-14 BK